Keyword: quadrupole
Paper Title Other Keywords Page
MOVIRO05 Permanent Magnets for Accelerators dipole, permanent-magnet, radiation, SRF 1
 
  • B.J.A. Shepherd
    STFC/DL/ASTeC, Daresbury, Warrington, Cheshire, United Kingdom
 
  Several groups internationally have been designing and building adjustable permanent magnet based quad-rupoles for light sources, colliders, and plasma accelera-tors because of their very high gradients and zero power consumption. There are now examples of widely adjusta-ble PM dipoles too. The ZEPTO project, based at STFC Daresbury Laboratory, developed several highly adjusta-ble PM-based dipole and quadrupole prototypes for CLIC, and is now building a quadrupole to be installed in Diamond to gain experience ahead of the Diamond-2 upgrade. This is a review and comparison of the recent designs globally with comments on the future prospects.  
video icon
 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2020-MOVIRO05  
About • paper received ※ 10 June 2020       paper accepted ※ 22 June 2020       issue date ※ 10 October 2020  
Export • reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)  
 
WEVIR03 Microbunch Rotation as an Outcoupling Mechanism for Cavity-based X-Ray Free Electron Lasers FEL, electron, cavity, undulator 35
 
  • R.A. Margraf, Z. Huang
    Stanford University, Stanford, California, USA
  • Z. Huang, J.P. MacArthur, G. Marcus
    SLAC, Menlo Park, California, USA
 
  Funding: This work was supported by the Department of Energy, Laboratory Directed Research and Development program at SLAC National Accelerator Laboratory, under contract DE-AC02-76SF00515.
Electron bunches in an undulator develop periodic density fluctuations, or microbunches, which enable the exponential gain of power in an X-ray free-electron laser (XFEL). For certain applications, one would like to preserve this microbunching structure of the electron bunch as it experiences a dipole kick which bends its trajectory. This process, called microbunch rotation, rotates the microbunches and aligns them perpendicular to the new direction of electron travel. Microbunch rotation was demonstrated experimentally by MacArthur et al. with soft x-rays* and additional unpublished data demonstrated microbunch rotation with hard x-rays. Further investigations into the magnetic lattice used to rotate these microbunches showed that microbunches can be rotated using an achromatic lattice with a small R56, connecting this technique to earlier studies of achromatic bends. Here, we propose and study a practical way to rotate Angstrom-level microbunching as an out-coupling mechanism for the Optical Cavity-Based X-ray FEL (CBXFEL) project at SLAC.
*J. P. MacArthur, A. A. Lutman, J. Krzywinski, and Z. Huang, "Microbunch Rotation and Coherent Undulator Radiation from a Kicked Electron Beam", Physical Review X, vol. 8, no. 4, Nov. 2018.
 
video icon
 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2020-WEVIR03  
About • paper received ※ 01 June 2020       paper accepted ※ 12 June 2020       issue date ※ 11 August 2020  
Export • reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)  
 
WEVIR12 Machine Learning Techniques for Optics Measurements and Corrections optics, controls, simulation, network 61
 
  • E. Fol, R. Tomás García
    CERN, Meyrin, Switzerland
  • G. Franchetti
    GSI, Darmstadt, Germany
 
  Recently, various efforts have presented Machine Learning (ML) as a powerful tool for solving accelerator problems. In the LHC a decision tree-based algorithm has been applied to detect erroneous beam position monitors demonstrating successful results in operation. Supervised regression models trained on simulations of LHC optics with quadrupole errors promise to significantly speed-up optics corrections by finding local errors in the interaction regions. The implementation details, results and future plans for these studies will be discussed following a brief introduction to ML concepts and its suitability to different problems in the domain of accelerator physics.  
video icon
 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2020-WEVIR12  
About • paper received ※ 02 June 2020       paper accepted ※ 12 June 2020       issue date ※ 16 June 2020  
Export • reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)